Improvement in rotary engines



NrTnD STATES PATENT OFFICE.

JOHN B. ROOT, OF NEW YORK, N. Y., ASSIGNOR TO ROOTS ROTARY ENGINECOMPANY, OF SAME PLAGE.

IMPROVEMENT IN ROTARY ENGINES.

Spcciiicaton forming part of Letters Patent N0. 43,744, dated August 2,1864.

To all whom it may concern:

15e it known that I, JOHN Il. ROOT, of the c'zty, county, and State ot'New York, have invented a new and useful Improvement in otary Engines;and I do hereby declare that vthe following is a full, clear, and exactdescription thereof, which will enable any person skilled in the art tomake and use the same, reference locinghad to the accompanying drawings,forming a part of this specilieation, in which- Figure l is a verticalsection in a plane parallel with the plane of rotation ot' an enginewith my improvements. Fig. 2 is an axial section of the same.

Similar letters of reference indicate thc same parts.

This invention relates to that'description of rotary engine whose innerrotary cylinder or drum, to which the pistons are attached, is arrangedeccentrically withi'i a larger stationary cylinder.

It consists in an. improved mode of obtaining the center bearing for thepistons, whereby the construction of the engine is simplilied and alarger steam-space may be obtained in a cylinder of a given diameter.

lhe engine represented .is supposed to be, in all respects not otherwiseherein described, substantially like that which is described in LettersPatent No. 1,204, granted to me on the 30th day of April, 1861, andassigned to Roots Rotary Steam Engine Oom pany. A is the stationaryouter cylinder. O is the inner rotary cylinder or piston-drum, and D isthe shaft ofthe said drum, which is also the'main shaft of the engine. FF F are the pistons, and d d d the cylindrical segment-pieces whichconstitute the guides of the pistons.

Instead ot' the drum O being made solid and having the shaft D extendingright through it, as described in Letters Patent No. 1,204, herinabovementioned, the said drum is made hollow or with acentral cavity, i fz',that the pistons may be extended directly to or beyond the centerthereof and'be connected together at their inner ends within the saidcavity, and has the shaft D projecting from one side only, and extendingthrough one head B ofthe cylinder A. In the other cylinder-head B thereis firmly secured a pin, I, which is arranged concentric With the boreof the cylinder A, and which enters the cavity it' ofthe piston-d umthrough an opening, k k, provided on the corresponding side of the saiddrum for the purpo e of connecting the several pisons F F F, and servingas the* center hearing ai ound which the said pistons revolve. To enailethe said pistons to loe all fitted to the said pin, they are extended tothe center of the cylinder and fitted together in a'manner substantiallylike the joint of a hinge, as shown atjj in Fig. 2, and bored thror ghfor the reception ofthe said pin.

The operation of the pistons is substantially the same when the piu I isused as the center bearii g as it is when they are constructed withsegment-pieces titfed with grooves inthe cylinder-heads, as described inLetters Patent No. L20-I; but it will be readily understood, by acomparison of the two modes ot' providing the center bearing for thepistons, that the pin I is by far the simplest in construction, and,moreover, it allows the pistoirdrum O to be reduced in diameter, and soenables a deeper steam-space to be obtained between the said drum andthe cylinder A.

What I claim as my invention, and desire to secure by Letters Patent, is

The stationary pin I, securedin the ccnte of one of the cylinder heads,entering a central cavity in the piston-drum and connecting and servingas center bearing for the several pistons within the drum, substantiallyas herein specified.

JOHN B. ROOT.

Witnesses:

J. P. HALL, 1. W. OooMBs.

